Compilation failed under VS2015 with master

[git45016683]

Description

I work on VS2015，and i want to make some unittest with doctest for my project。
I open doctest.sln with VS2015 and build it after configure doctest with CMake on VS2015， but it compilation failed，it show so maby error messages like below：

‘’‘
doctest_fwd.h(2194): error C2220: 警告被视为错误 - 没有生成“object”文件
doctest_fwd.h(2194): warning C4668: 没有将“_MSVC_LANG”定义为预处理器宏，用“0”替换“#if/#elif”
doctest.cpp(194): error C2059: 语法错误:“<L_ATTRIBUTE_SPECIFIER>”
doctest.cpp(194): error C2893: 未能使函数模板“void doctest::`anonymous-namespace'::throw_exception(const Ex &)”专用化
s\doctest.cpp(194): note: 用下列模板参数:
s\doctest.cpp(194): note: “Ex=std::logic_error”
’‘’

Steps to reproduce

1. git clone doctest
2. configure doctest with CMake（VS2015 && Win32）
3. open doctest.sln with VS2015 and build all（i want to run example but example build failed too）
4. build failed，show error message like above

Extra information

• doctest version: master
• Operating System: Win11
• Compiler+version: Microsoft Visual Studio Community 2015/版本 14.0.23107.0 D14REL/Visual C++ 2015 00322-20000-00000-AA666

[git45016683]

and i wrote a test demo include doctest.h (v2.4.9) with VS2015, it built failed, show error message like below:

doctestdemo0\doctest.h(3238): error C2059: 语法错误:“<L_ATTRIBUTE_SPECIFIER>”
doctestdemo0\doctest.h(3238): error C2893: 未能使函数模板“void doctest::`anonymous-namespace'::throw_exception(const Ex &)”专用化
doctestdemo0\doctest.h(3238): note: 用下列模板参数:
doctestdemo0\doctest.h(3238): note: “Ex=std::logic_error”
doctestdemo0\doctest.h(3282): fatal error C1075: 左侧的 大括号“{” 与文件结尾不匹配

demo code just like:

#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
#include "doctest.h"

int fact(int n) { return (n <= 1) ? n : fact(n-1)*n; }

TEST_CASE("test_doctest") {
	CHECK(fact(1) == 1);
}

[git45016683]

update：
doctest build succeed after i built it with VS2022；
so i want to know which version can build with VS2015， because README talk us doctest support VS2015.